Fusible chain-link.



E. R. LEONARD.`

PUSIBLE CHAIN LINK.

APPLICATION FILED MAB.. 6. 1913.

Patented 1360.30, 191s.

ELOF R. LEONARD, 0F WOODCLIFF, NEW JERSEY,

FUSIBLE CHAIN-LINK.

Specification ofLetters Patent.

Application led March 6, 1913.

Patented nec. so, isis. Serial No. 752,262.

To all fio/wm t may concern Be it known that I, ELoF'R. LEONARD, a citizen of the United States, residing at Woodcliff, in the State of New Jersey, have invented certain new and useful Improvements in Fusible Chain-Links, of which the following is a vspecication.

My invention relates particularly to the use in a chain of the class which is used to carry the counter-balancing weights for window sashes, of a fusible link or links formed of wire and so constructed as to have a form substantially similar to the non fusible links of the` chain, so that the composite chain may travel freely over the chain-pulley without the fusible links interfering with the ordinary operation of the pulley or sticking in the sash frame openings through which the chain travels.

The particulars of my improvements are hereinafter pointed out and claimed.

In the drawings, in which corresponding parts are designate-d by similar reference numerals, Figure l is a side view of a sash pulley, partly in section, carrying a piece of chain provided with my improved fusible links; Fig. 2 is an edge view of the same, looking to the right on Fig. 1, and showing the pulley in full lines; Figs. 3, 4 and 5 are respectively side end and cross-sectional views of one of my improved links, and Fig. 6 is a side view of one of the two loops with which the link is formed.

The link O embodies two stapleelike pieces of wire, each having its central portion bent into an eye or loop l, while its ends are extended into the straight and parallel shanks 2, 2. Two of these pieces of wire, so bent are combined by inter-straddling their Shanks, as shown in the drawings, and are secured in this position by a soft-solder 3, fusible at a comparatively low temperature as is usual in fusible joints. This solder not only adheres to the contiguous sides of the Shanks, but forms a core i extending longitudinally between the shanks and expanding at each end so as to form an anchor 6, in the opening of the loop l; so that any longitudinal strain upon the link is borne not only by solder uniting the parallel shanks of the wire, but is also carried by the central core 4t which has its extended ends 6 anchored in Vthe loops l. The solder, also, is, preferably, so disposed as to present concave surfaces 5, between adjacent shanks 2, thereby increasing its heat absorbing surface and accelerating its melting when exposed to abnormal heat. It will be seen that by thus applying the solder to the cylindrical shanks a more extensive gripping surface is obtained than could be secured by soldering two flat surfaces, of widths corresponding to the diameter of the wire, directly to each other. So that not only are the wire shanks of the links given a form combining great strength with compactness, but the solder is given extensive gripping surfaces to fasten upon, in such a form as to hold tenaciously and to melt rapidly when heated. The looped ends of the link adapt it to be substituted for one of the links in an ordinary sash-chain; while its constricted central portion presents no obstacles to it-s traveling as part of chain through the groove 11 of the pulley 10 or wherever the standard links 9 of the chain may go.

Several fusible links O may be inserted in the same chain, if desired, as shown in Figs. l and 2; the advantage being that thereby the area of the construction in which the chain is used which is sensitive to heat is extended and the efficiency of the device is increased. And the use of the fusible link as part of the sash chain enables me to dispense with special devices for attaching a fusible link to the sash weight or sash, and to simplify the construction by using the sash chains only.

It will be understood that the parting of the sash chain by the fusing of a link may be made to call into action supplementary sash closing appliances, such as auxiliary weights or the like, in well understood manners. And I do not now enter into a description of such auxiliary apparatus as it forms no part of my present invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is;

1. A fusible link, for sash chains and the like, embodying two loops of wire adapted to resist a high temperature, and having extended, inter-straddling shanks, and' a longitudinal core of solder fusible at a comparatively low temperature, intermediate of and adhering to said Shanks.

2. A fusible link, for sash chains and the like, embodying two pieces of wire adapted to resist a high temperature and having expanded looped ends and straight extended shanks inter-straddling with each other, and a central core of solder fusible at a comparatively low temperature, extending longitu low temperature, said solder presenting condlnally between and uniting sald shanks and cave surfaces between adjacent portlons of 10 expanding into the said terminal loops. l the Wire loops.

3. A fusible link for sash chains and tie T 5 like, embodying ai pair of looped Wires ELOF R LEOBARD' adapted to resist a high temperature and lVitnesses: having straight Shanks inter-straddled and HOWARD H. Ron/E, joined by a solder fusible at a comparatively AGNES GERHAUSER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

